Which four software based media resources require that the Cisco IP voice media stream Application be activated?

Which four software based media resources require that the Cisco IP voice media stream Application be
activated?

A.
MOH.

B.
SIP.

C.
H.323 Gateways.

D.
Annunciator.

E.
Gatekeeper.

F.
MTP.

G.
Audio conferencing.